Merge branch 'master' of ssh://ftp-master.debian.org/srv/ftp.debian.org/git/dak

* 'master' of ssh://ftp-master.debian.org/srv/ftp.debian.org/git/dak:
  Fix up permissions
  metadata generation work
  Use UnpackedSource in queue.py.
  Improve exception handling in make-changelog.
  Work with service mode
  Use UnpackedSource in make-changelog.
  Add new class UnpackedSource and a new test.
  Start work on Packages import